Shearing machine with a pivotal blade having eccentric means to adjust blade along axis of the pivot



Feb 23, 1965 H. RlnGwAY SHEARING MACHINE WITH A PIVOTAL BLADE HAVING ECCENTRIC MEANS TO ADJUST BLADE.' ALONG AXIS 0F THE PIVOT 2 SheetswSheet 2 Filed Dec,v 13, 1960 J 3 170 357 SHEARING MAcrnNE WTH A PlvoTAL nLADE `HAVING ECCENTRIC MEANS To ADJUST BLADE ALoNG Axis or THE PrvoT l l Harry Ridgway, Sandal, Wakefield, England, assignor to VThis invention relates to machines for cutting or shearing sheets or plates (hereinafter termed plates) of the type embodying a fixed blade and a movable blade capable of a pivotal motion. fShearing machines of the type with which this invention is concerned include a blade carrying beam pivoted to a frame structure with the beam lying longitudinally at a right angle to the beam axis. The blade may have a downward rake away from the beam pivot in relation to a fixed blade, and means for operating the beam at a point remote from the pivot. Such a machine is designed to be capable of cutting varying thicknesses of plate and with thicker plates, say in the order of three-quarters of an inch, it is advantageous to provide cutting clearance for the beam blade towards the end of its stroke.

According to the present invention there is provided `a shearing machine, comprising a blade carrying beam pivoted to a framestructure in relation to a iixedrblade, said beam being carried by a pivot element mounted to be capable of axial movement and transmitting lateral moves United States PatCIItfOLFCfment to the beam, and means for adjusting said element Vaxially within given limits to provide a required predetermined cutting clearance for the blade of the beam in relation to the fixed blade.

The invention includes adjusting means having an eccentric'located between spaced stop members. At least one of the stop membersmay be adjustable, say screwthread adjustment. ,Y

The invention will now be more particularly described with reference to the accompanying drawings, in which:

FIG. lv is a diagrammatic drawing of a shearing machine;

FIGQZ is a sectional elevation of the pivot shaft and adjusting means of the machine beam carrying the movable blade;

FIG. 3 is a planview from above of the shaft adjusting means; and Y FIG. 4 is a sectional elevation on the line A-A of 'i FIG. 3.

In the illustrated embodiment of this invention a pivot shaft 1 is mounted horizontally in a bearing 2 of the machine frame structure 3 and on one stepped projecting end 4 is pivoted the blade vcarrying beam. 5. x The blade beam is furnished with a housing 6 enclosing main thrust roller bearings 7 mounted between stop means on the part 4 ofthe pivot shaft and such housing has a removable end plate S containing smaller thrust roller bearings 9, 1t) retained on the outer reduced end 11 of the pivot shaft by`a nut 12 on the further reduced end 13. This end 13 lof the shaft projects into a removable cover cap 14 which has a removable plug 15 for the introduction of a lubricant through a grease nipple 16 in the end of the shaft to force it through ducts 17, 1% I(or channels) to the main roller bearings '7.

this end is of stepped formation, and this lshaft end passes through an upstanding bearing 20 through which is formed a vertical hole 21 olf-set to one side of the Ashaft end andin this hole is Vlocated a spindle 22 having one part 23,

intermediate its ends, forming an eccentric. Opposite this eccentric, in the same plane as and parallel withthe shaft axis, are formed a pair of holes in alignment and in these are arranged a pair of small plungers 24 operable by the eccentric. Said eccentric is smaller in diameter than the spindle and lthus at least one plunger has its inner end between shoulders and so positioned retains the spindle against withdrawal. On each side of this bearing is arranged a stop collar 25 or 26 each screw-threaded on to part 27 or 28 of the pivot shaft for adjustmentV purposes. These two collars are spaced to furnish adjustable working clearance for the shaft 1 to be given required axial adjustment. The eccentric carrying spindle 22 is furnished lwith operating means, such as a head member 29 with a through handle 30 like a double tommy-bar.

With the above arrangement, by rotating the spindle 22 and thus the eccentric 23 the latter will apply thrust to one ofthe stop collars 25 or 26 to move the shaft l'axially and thus the pivot end of the beam 5 so that the blade 31 carried by the beam 5 will'be adjusted towards or away from the usual fixed cutting blade 32. It will readily be understood that the stop collars 25, 26 can be readily Vadjusted for the `initial setting of the movable blade in relation to the fixed blade e.g. with a new machine and also after a grinding operation on the blades, and the eccentric 23 provides limited variation of the setting in a simple manner. To facilitatetsetting the spindle operating f `head 29 is graduated and rotatable in relation to a mark 33 onrthe top of the bearing 20.

With-the above apparatus the movable blade on theY rection there`of,'said movable blade being mounted `in y cutting relation to said fixed blade, collars mounted on said shaft on opposite sides of one of said iixed bearings, a spindle mounted for rotation about its longitudinal axis on said fixed bearing, an eccentricmounted on said spindle, means vfor rotating said spindle and eccentric, a pair of plungers mounted on said fixed bearing for sliding movement parallel to the` axis of said pivot shaft, each of said plungers being positioned tightly between said eccentric and one of said collars whereby rotary movement of said spindle and eccentric acting through said plungers and collars Will effect endwise movement of said. pivot shaft and lateral movement of said movable blade relative to said fixed blade. Y

2. A heavy-duty metal plate shearing machine as defined in claim 1 in which said collars are mounted on said pivot shaft by screw threads.

3. A heavy-duty metal plate shearing machine as defined in claimV l in which said spindle and eccentric are mounted in a vertical bore in said fixed bearing and said Y Patented Feb. 23, `1965 v plungers are mounted in a horizontal bore in said fixed 2,110,047 Marorfsky Mar. 1, 1938 bearing intersecting said Vertical bore. 2,370,311 Hercik Feb. 27, 1945 Y 2,638,804 Heinrich May 19, 1953 References Cited in the le of this patent 2,779,409 Becker Jan. 29, 1957 UNITED STATES PATENTS 5 FOREIGN PATENTS 18,065 Toulmin Aug. 25, 1857 111,403 Germany June 15, 1900 1,925,161 Williams Sept. 5, 1933 

1. A HEAVY-DUTY METAL PLAT SHEARING MACHINE COMPRISING A MACHINE FRAME, A FIXED BLADE SECURED TO SAID FRAME, ALINED, SPACED, FIXED BEARINGS SECURED TO SAID FRAME, A PIVOT SHAFT SLIDABLY MOUNTED IN SAID FIXED BEARINGS, A MOVABLE BLADE PIVOTALLY MOUNTED ON SAID SHAFT AND SECURED AGAINST MOVEMENT RELATIVE THERETO IN THE AXIAL DIRECTION THEREOF, SAID MOVABLE BLADE BEING MOUNTED IN CUTTING RELATION TO SAID FIXED BLADE, COLLARS MOUNTED ON SAID SHAFT ON OPPOSITE SIDES OF ONE OF SAID FIXED BEARINGS, A SPINDLE MOUNTED FOR ROTATION ABOUT ITS LONGITUDINAL AXIS ON SAID FIXED BEARING, AN ECCENTRIC MOUNTED ON SAID SPINDLE, MEANS FOR ROTATING SAID SPINDLE AND ECCENTRIC, A PAIR OF PLUNGERS MOUNTED ON SAID FIXED BEARING FOR SLIDING MOVEMENT PARALLEL TO THE AXIS OF SAID PIVOT SHAFT, EACH OF SAID PLUNGERS BEING POSITIONED TIGHTLY BETWEEN SAID ECCENTRIC AND ONE OF SAID COLLARS WHEREBY ROTARY MOVEMENT OF SAID SPINDLE AND ECCENTRIC ACTING THROUGH SAID PLUNGERS AND COLLARS WILL EFFECT ENDWISE MOVEMENT OF SAID PIVOT SHAFT AND LATERAL MOVEMENT OF SAID MOVABLE BLADE RELATIVE TO SAID FIXED BLADE. 